﻿// --------------------------------------------------------------------------------------------------------------------
// <copyright file="ObjectToDoubleConverter.cs" company="PropertyTools">
//   Copyright (c) 2014 PropertyTools contributors
// </copyright>
// <summary>
//   Converts object instances to double instances.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

namespace PropertyTools.Wpf
{
    using System;
    using System.Globalization;
    using System.Windows;
    using System.Windows.Data;

    /// <summary>
    /// Converts <see cref="object" /> instances to <see cref="double" /> instances.
    /// </summary>
    [ValueConversion(typeof(object), typeof(double))]
    [Obsolete]
    public class ObjectToDoubleConverter : IValueConverter
    {
        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <param name="value">The value produced by the binding source.</param>
        /// <param name="targetType">The type of the binding target property.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns <c>null</c>, the valid <c>null</c> value is used.
        /// </returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null)
            {
                return 0;
            }

            // Explicit unboxing
            var t = value.GetType();
            if (t == typeof(int))
            {
                return (int)value;
            }

            if (t == typeof(long))
            {
                return (long)value;
            }

            if (t == typeof(byte))
            {
                return (byte)value;
            }

            if (t == typeof(double))
            {
                return (double)value;
            }

            if (t == typeof(float))
            {
                return (float)value;
            }

            return DependencyProperty.UnsetValue;
        }

        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <param name="value">The value that is produced by the binding target.</param>
        /// <param name="targetType">The type to convert to.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns <c>null</c>, the valid <c>null</c> value is used.
        /// </returns>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            // if (targetType==typeof(double))
            return value;

            // return DependencyProperty.UnsetValue;
        }
    }
}